Dedicated Servo Layer for Continuous Head Position Tracking
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Solution Overview
Problem
Conventional data storage devices face challenges in achieving high precision in tracking the movement of read/write heads due to limited servo information availability and simultaneous read/write capabilities, leading to reduced storage capacity and increased power consumption.
Innovation Solution
A dedicated servo layer with multiple tracks, each carrying distinct servo signals at predetermined frequencies, allows for continuous servo readback and improved positioning accuracy, enabling simultaneous read and write operations while maintaining high storage capacity and low power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If embedded servo is used with servo information running radially across tracks in servo wedges, then device complexity is reduced, but measurement precision of head position deteriorates because servo information is only detected when head moves over servo wedges
Solution Approach 1:
The patent divides the recording medium into two distinct layers: a dedicated servo layer containing continuous servo signals and a data layer for user data. This segmentation allows the servo system to continuously track head position without interrupting data operations, resolving the contradiction between simple embedded servo structure and precise continuous position measurement.
2Measurement precision
If dedicated servo layer is used with continuous servo signals, then measurement precision of head position is improved, but device complexity increases due to separate servo and data layers
Solution Approach 1:
The patent adds a vertical dimension to the traditional planar structure by implementing a dedicated servo layer beneath the data layer. This dimensional change allows continuous servo signals to coexist with data signals in different spatial planes, enabling high precision tracking without increasing lateral complexity or interfering with data operations.
3Device complexity
If head performs only read or write operation sequentially, then device complexity is reduced, but productivity deteriorates due to inability to perform simultaneous operations
Solution Approach 1:
The patent enables continuous useful action by allowing the read/write head to perform read operations on the data layer and write operations on the servo layer simultaneously. The dedicated servo layer provides continuous position feedback without interrupting data read/write operations, thereby increasing productivity while maintaining manageable device complexity through non-interfering signal planes.
Data Source
AI summary
Various embodiments provide a recording medium. The recording medium may include a dedicated servo layer for providing servo information. The dedicated servo layer may include a plurality of tracks. A first track may include a first servo signal. A second track may include a second servo signal. The first servo signal and the second servo signal may include a plurality of common transitions. The transitions may be provided at a pre-determined frequency.